Sangzhi in context: Street-network sprawl trends

Sangzhi in context

2.73.64.55.4<19751976–19901991–20052006–2020SNDi of street additions
2.73.64.55.4<19751976–19901991–20052006–2020SNDi of entire street network
SangzhiHunan (Region)China (Country)

The chart above shows SNDi trends for new street additions (left panel) and the entire network (right panel), with Sangzhi plotted against Hunan and China. The SNDi of new construction in Sangzhi was at its lowest in 1991-2005, compared to Hunan which peaked in 1976-1990 and China which followed a zig-zag trend with an overall increase. Most recently, Sangzhi's incremental SNDi rose from 2.2 to 3.47 between 1991-2005 and 2006-2020. In terms of the aggregate network, Sangzhi ranked 50th out of 89 cities in Hunan and 1090th out of 1843 in China as of 2020.

New Street Additions (2006–2020)

SNDi value
3.47
Rank in China
1139th of 1843
Rank in Hunan
60th of 89

Entire Network (Aggregate)

SNDi value
3.08
Rank in China
1090th of 1843
Rank in Hunan
50th of 89

Rankings go from most connected to most disconnected — rank 1 is the most connected.

What about similarly populated cities?

0.91.82.73.6<19751976–19901991–20052006–2020SNDi of street additions
0.91.82.73.6<19751976–19901991–20052006–2020SNDi of entire street network
SangzhiBaniyasAklera

In new street additions, Sangzhi built increasingly connected streets from 1975 through 1991-2005, then shifted to more disconnected patterns, while Baniyas built increasingly disconnected streets over time and Aklera built increasingly disconnected streets from 1975 through 1991-2005, then improved. Looking at the full network, Baniyas and Aklera both became progressively more disconnected, while Sangzhi became more connected from 1975 through 1991-2005, then grew more sprawly from 1991-2005 onwards. Sangzhi and Baniyas have been converging in their street-network character since 1975.